Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bd0c11ba7ef2b1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 21:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 275df5363ed1deb5d6c7effc34f6416c SHA-1: 3ceadb80e74cc2078a435f9b8bd4d8811fc2b59f SHA-256: e1bd0c11ba7ef2b183fe10916814e12ec32e73129ad3ccd668db9c8771e31256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=letter+of+credit+definition+pdf PDF link annotation
    • http://tsradviseurs.nl/mailing/images/photo/file/xunezetuvitiguxoziwonon.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/gewuxifed.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533d8a212e---7843987716.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1os7nhh8kobkjjkj4u9apr2flj/lewafumawusup.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/xegamedejawefefili.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a2d2c938---remogizexebaje.pdfIn PDF document text
    • http://rld-carbon.ru/file/39177158310.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/83787d418f5030b9b9d5bb8302c4dd59/20788637882.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab195a72ca7---roxixekezus.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/dutulufedejojitav.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/jeserubixuwan.pdfIn PDF document text
    • https://rosycaffe.com/file/11730720547.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/gopenikusuku.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/51777632839.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ba7722e3f1d37dfe11ed8b058f8b22f5/64665675660.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/soragadib.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17d6951a8---74023046630.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53888b129---zelekuwakavikuneramopisab.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/13600752732.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/komosadefokipelisedaladi.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/44949656464.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/503fcfc8f4ec426f8206c83ccf5e5730/49406608220.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/23771449746.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fab21fff1f70dfe794bae84fe95b5792/fapipezazuditeligosabaroj.pdfIn PDF document text
    • http://bio86.fr/fichiers/lixagimixesuronomores.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/siwegusefasutigof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 17204 bytes
SHA-256: 2c516cef0f1871f2db05b27ff1368888f49a11d82e5e27752ba626e986aa6435
font_02_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10192 bytes
SHA-256: d944818097ff617446a7a3a7acdcd01e6ff1c7ba7b9ba174ac6ba5ac6dcaed0f

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